Indicates someone speaking at length, often more than necessary, which can be tedious for listeners. During the meeting, he held forth about minor details, losing the team's interest.
Pro Tip 2/3
Strong Opinions
Implies the speaker has firm beliefs on the subject and presents them with confidence, sometimes aggressively. She held forth on the unfairness of the new policy with great passion.
Pro Tip 3/3
Expertise Assumed
Often used when someone is discussing a topic they're knowledgeable about or perceived as an expert in. The professor held forth on the significance of Shakespeare in modern literature.